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gwQuantitativeAssessmentYear - Required.

Provide the year on which the assessment of status is based. This may be the year that the groundwater body was monitored. In case of grouping this may be the year in which monitoring took place in the groundwater bodies within a group that are used to extrapolate results to non-monitored groundwater bodies within the same group. A period is possible (e.g. 2011--2013).